<?php

// Num 记录和数据相关的类库
 declare(strict_types=1);
namespace app\common\lib;


class Num
{
    public static function getCode(int $len=4):int{
        $code = rand(1000,9999);
        if ($len == 6){
            $code = rand(100000,999999);
        }
        return $code;
    }
}